import XLSX from 'xlsx';


export function saveAs(obj, fileName) {//当然可以自定义简单的下载文件实现方式
  var tmpa = document.createElement("a");
  tmpa.download = fileName || "下载";
  tmpa.href = URL.createObjectURL(obj); //绑定a标签
  tmpa.click(); //模拟点击实现下载
  setTimeout(function () { //延时释放
    URL.revokeObjectURL(obj); //用URL.revokeObjectURL()来释放这个object URL
  }, 100);
};

export function downloadExl(data, name) {
  var wb = { SheetNames: ['Sheet1'], Sheets: {}, Props: {} };
//wb.Sheets['Sheet1'] = XLSX.utils.json_to_sheet(data);//通过json_to_sheet转成单页(Sheet)数据
  data = XLSX.utils.json_to_sheet(data);
// data["B1"] = { t: "s", v: "asdad" };
// data["!merges"] = [{//合并第一行数据[B1,C1,D1,E1]
// s: {//s为开始
// c: 1,//开始列
// r: 0//开始取值范围
// },
// e: {//e结束
// c: 4,//结束列
// r: 0//结束范围
// }
// }];
  wb.Sheets['Sheet1'] = data;
  this.saveAs(new Blob([this.s2ab(XLSX.write(wb, this.wopts))], { type: "application/octet-stream"}), name + '.xls');
};
export function s2ab(s) {
  if (typeof ArrayBuffer !== 'undefined') {
    var buf = new ArrayBuffer(s.length);
    var view = new Uint8Array(buf);
    for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
    return buf;
  } else {
    var buf = new Array(s.length);
    for (var i = 0; i != s.length; ++i) buf[i] = s.charCodeAt(i) & 0xFF;
    return buf;
  }
}
